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Note 3 - Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
   
As of September 30, 2018
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Cost
    
Gain
    
Loss
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
36,057
     $
111
     $
(512
 )   $
35,656
  
Obligations of state and political subdivisions
    
51,468
      
1,003
      
(909
 )    
51,562
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
128,703
      
6
      
(4,600
 )    
124,109
  
Corporate securities
    
4,042
      
5
      
(73
 )    
3,974
  
Commercial mortgage-backed securities
    
24,990
      
9
      
(832
 )    
24,167
  
Other asset-backed securities
    
164
      
1
      
—
      
165
  
Total
   $
245,424
     $
1,135
     $
(6,926
 )   $
239,633
  
   
As of December 31, 2017
  
   
 
 
 
  
Gross
    
Gross
    
 
 
 
   
Amortized
    
Unrealized
    
Unrealized
    
Estimated
  
(Amounts in thousands)
  
Cost
    
Gain
    
Loss
    
Fair Value
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
40,319
     $
196
     $
(146
 )   $
40,369
  
Obligations of state and political subdivisions
    
77,412
      
1,910
      
(478
 )    
78,844
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
116,062
      
69
      
(1,539
 )    
114,592
  
Corporate securities
    
5,079
      
18
      
(105
 )    
4,992
  
Commercial mortgage-backed securities
    
26,995
      
24
      
(378
 )    
26,641
  
Other asset-backed securities
    
2,540
      
4
      
(28
 )    
2,516
  
Total
   $
268,407
     $
2,221
     $
(2,674
 )   $
267,954
  
Amortized Cost and Estimated Fair Value Available for Sale Securities [Table Text Block]
   
Available-For-Sale
  
(Amounts in thousands)
  
Amortized Cost
    
Fair Value
  
Amounts maturing in:
  
 
 
 
  
 
 
 
One year or less
   $
1,550
     $
1,554
  
After one year through five years
    
79,378
      
77,506
  
After five years through ten years
    
91,285
      
88,761
  
After ten years
    
73,211
      
71,812
  
Total
   $
245,424
     $
239,633
  
Schedule of Realized Gain (Loss) [Table Text Block]
   
Three Months Ended September 30,
    
Nine Months Ended September 30,
  
(Amounts in thousands)
  
2018
    
2017
    
2018
    
2017
  
Proceeds from sales of securities
   $
7,062
     $
20,640
     $
27,567
     $
47,892
  
                                 
Gross realized gains on sales of securities:
                                
Obligations of state and political subdivisions
   $
104
     $
31
     $
260
     $
112
  
Residential mortgage-backed securities and collateralized mortgage obligations
    
—
      
16
      
—
      
53
  
Corporate securities
    
—
      
20
      
—
      
30
  
Commercial mortgage-backed securities
    
—
      
3
      
—
      
3
  
Total gross realized gains on sales of securities
    
104
      
70
      
260
      
198
  
                                 
Gross realized losses on sales of securities:
                                
U.S. government & agencies
    
(43
 )    
—
      
(43
 )    
—
  
Obligations of state and political subdivisions
    
(1
 )    
(10
 )    
(72
 )    
(10
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
(40
 )    
(22
 )    
(40
 )    
(46
 )
Corporate securities
    
—
      
—
      
—
      
(3
 )
Commercial mortgage-backed securities
    
(19
 )    
—
      
(19
 )    
—
  
Other asset-backed securities
    
—
      
—
      
(45
 )    
—
  
Total gross realized losses on sales of securities
    
(103
 )    
(32
 )    
(219
 )    
(59
 )
Gain on investment securities, net
   $
1
     $
38
     $
41
     $
139
  
Schedule of Unrealized Loss on Investments [Table Text Block]
   
As of September 30, 2018
  
   
Less Than 12 Months
    
12 Months or More
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
(Amounts in thousands)
  
Value
    
Losses
    
Value
    
Losses
    
Value
    
Losses
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
16,501
     $
(225
 )   $
9,060
     $
(287
 )   $
25,561
     $
(512
 )
Obligations of states and political subdivisions
    
10,394
      
(257
 )    
13,126
      
(652
 )    
23,520
      
(909
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
43,278
      
(1,250
 )    
72,572
      
(3,350
 )    
115,850
      
(4,600
 )
Corporate securities
    
—
      
—
      
2,953
      
(73
 )    
2,953
      
(73
 )
Commercial mortgage-backed securities
    
5,215
      
(159
 )    
17,313
      
(673
 )    
22,528
      
(832
 )
Total temporarily impaired securities
   $
75,388
     $
(1,891
 )   $
115,024
     $
(5,035
 )   $
190,412
     $
(6,926
 )
   
As of December 31, 2017
  
   
Less Than 12 Months
    
12 Months or More
    
Total
  
   
Fair
    
Unrealized
    
Fair
    
Unrealized
    
Fair
    
Unrealized
  
(Amounts in thousands)
  
Value
    
Loss
    
Value
    
Loss
    
Value
    
Loss
  
Available-for-sale securities:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
U.S. government & agencies
   $
18,140
     $
(102
 )   $
2,131
     $
(44
 )   $
20,271
     $
(146
 )
Obligations of states and political subdivisions
    
15,030
      
(255
 )    
8,368
      
(223
 )    
23,398
      
(478
 )
Residential mortgage-backed securities and collateralized mortgage obligations
    
75,323
      
(827
 )    
31,036
      
(712
 )    
106,359
      
(1,539
 )
Corporate securities
    
—
      
—
      
2,934
      
(105
 )    
2,934
      
(105
 )
Commercial mortgage-backed securities
    
11,162
      
(151
 )    
10,026
      
(227
 )    
21,188
      
(378
 )
Other asset-backed securities
    
2,167
      
(28
 )    
—
      
—
      
2,167
      
(28
 )
Total temporarily impaired securities
   $
121,822
     $
(1,363
 )   $
54,495
     $
(1,311
 )   $
176,317
     $
(2,674
 )